1xEV-DO

(EV-DO)

Part of a family of CDMA2000 1x digital wireless standards. 1xEV-DO
is a “3G” CDMA standard. EV-DO originally stood for “EVolution,
Data-Only”, but recently is also referred to as “EVolution,
Data-Optimized”.

EV-DO provides data rates over 10 times faster than 1xRTT, the previous data technology for CDMA networks.

Unlike
other “1x” standards, EV-DO only addresses data - not voice. It
requires a dedicated slice of spectrum, separate from voice networks
using standards such as 1xRTT.

There are currently two main versions of 1xEV-DO: “Release 0″ and “Revision A”.

Release
0 is the original version, and the first to be widely deployed. Rel. 0
offers data rates up to 2.4 mbps, averaging 300-600 kbps in the real
world. This is much faster than the 50-80 kbps typically offered by
1xRTT technology. Rel. 0 data rates are identical to 1xEV-DV Revision C.

Revision
A integrates most of the faster data technology from 1xEV-DV Revision
D, and improves latency. These enhancements allow features such as VoIP
and video calling.

Although EV-DO does not include voice
capability natively, Rev. A is fast enough to support VoIP technology
at service levels equal or better to 1xRTT voice technology. This may
be a future upgrade path for CDMA carriers if EV-DV development remains
stalled.

In terms of data speed and general technology evolution, the closest equivalent to EVDO for GSM/WCDMA networks would be HSDPA.

1xEV-DO
is based on a technology initially known as “HDR” (High Data Rate) or
“HRPD” (High Rate Packet Data), developed by Qualcomm. The
international standard is known as IS-856.

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